定量研究了大挤压比(81∶1)条件下Mg-6xZn-xY合金的微观组织和力学性能.结果表明:随着Zn、Y含量的增加,准晶相含量逐渐增加,α-Mg基体平均晶粒尺寸先减小后增大,Mg-6Zn-1Y合金中的α-Mg平均晶粒尺寸最小为2.9μm,且尺寸分布最均匀,其标准差也达到最小,为0.77 μm.随着Zn、Y含量的增加,Mg-Zn-Y合金的屈服强度和抗拉强度逐渐增大,延伸率逐渐降低.相比于α-Mg基体晶粒细化,细小准晶相含量的增加对提高Mg-6xZn-xY合金强度的作用更明显.
The microstructures and mechanical properties of extruded Mg-6xZn-xY alloys at the extrusion ratio of 81:1 were quantitatively investigated.The results show that with the content of Zn and Y increasing,Ⅰ-phase content gradually increases,while the average grain size of α-Mg matrix decreases first and then increases.The minimum average grain size of α-Mg in Mg-6Zn-1Y alloy is 2.9 μm,the size distribution is most uniform,and the standard deviation of α-Mg grain size also reaches the minimum of 0.77 p.m.With increasing the content of Zn and Y,the yield strength and the tensile strength of Mg-Zn-Y alloy increase,while the elongation decreases.The content increment of fineⅠ-phase improves the strength of Mg-6xZn-xY alloy more obviously than α-Mg grain refinement.
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